Zact plans to add retail distribution, a spokesperson said. It is promoting flexible, adjustable voice, text and data plans that consumers can customize to their needs and adjust on the fly from their device at any time.

Zact’s no-contract service is available with the LG Viper 4G LTE and LG Optimus Elite Android smartphones at unsubsidized prices of $399 and $99, respectively.

Key service-plan features include the ability for consumers to “create their own unique mix of talk, text and data and can even forego buying a data plan altogether to instead buy an app-specific data plan for maximum savings,” the company said.

Consumers don’t have to worry about overpaying because they “will always end up with the plan level that is exactly right based on actual usage,” the company said. For example, Zact will notify users if they are close to exceeding their plan’s limits so that they will be able to order more airtime from their device. A “never overpay” guarantee automatically credits a subscriber for what they would have saved if they hadn’t purchased a bigger plan than they needed.

The Zact service runs on the Sprint network with 4G/LTE service where available in Sprint’s footprint.